package com.graduate.filter;

import com.alibaba.fastjson.JSON;
import com.graduate.common.BaseContext;
import com.graduate.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1获取本次对象的url
        String requestURI = request.getRequestURI();
        //定义不需要匹配的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login",
                "/order/submit",
                "/alipay/**"
        };

        //2本次请求是否要处理
        boolean check = check(urls, requestURI);

        //3如果不需要处理，则直接放行
        if (check){
            filterChain.doFilter(request,response);
            return;
        }

        //4-1判断登陆状态，如果已登陆，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录,用户id为：{}",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        //4-2判断登陆状态，如果已登陆，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录,用户id为：{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }

        //6如果未登录，返回登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    public boolean check(String[] urls,String requestURL){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if (match){
                return true;
            }
        }
        return false;
    }
}
